clashing

A clash; the sound or action of clashing; violent collision.

conflicting, contrasting, or contrary; inconsonant, incompatible, or irreconcilable

mismatched, inharmonious, discordant or dissonant, not fitting well together (especially in regards to aesthetics, colors, clothing, or sounds)

adverse or antagonistic; disagreeing or opposing

Producing a clash or series of clashes.

From inside the mill there came a whizzing, whirring, and clashing sound, and now and then a bright saw-blade flashed in the air, as if in combat with the spirits of the night, to cut the stumps and uneven ends off the logs.